<template>
  <div class="person">
    <h1>情况一:监视【ref】定义的【基本类型】数据</h1>
    <h2>当前求和为:{{ sum }}</h2>
    <button @click="changeSum">点我sum+1</button>
  </div>
</template>

<script lang="ts" setup name="Person">
  import { ref, watch } from "vue";

  //数据
  let sum = ref(0);

  //方法
  function changeSum() {
    sum.value += 1;
  }

  //监视,  情况一:监视【ref】定义的【基本类型】数据
  const stopWatch = watch(sum, (newValue, oldValue) => {
    console.log("sum变化了", newValue, oldValue);
    if (newValue >= 10) {
      stopWatch();
    }
  });
</script>

<style scoped>
  .person {
    background-color: aqua;
    box-shadow: 0 0 10px;
    border-radius: 10px;
    padding: 20px;
  }

  button {
    margin-left: 5px;
    margin-right: 5px;
  }
</style>
